Insulator pin



Patented May 30, 1933 UNITED STATES PATENT OFFICE BENTLEY A. PLIMPTON AND KENT A. HAWLEY, OF BALTIMORE, MARYLAND, AS-

SIGNORS T0 LOCKE INSULATOR CORPORATION, OF BALTIMORE, MARYLAND, A

CORPORATION OF MARYLAND INSULATOR yPIN Application filed February 3, 1928. Serial No. 251,628.

The invention relates to insulator supports and has special reference to pins such as are employed in connection with cross arms or other structural elements 'for supporting insulators. f

The principal object of the invention is to provide an insulator pin embodying the minimum number of parts so related or connected that separation thereof will be prevented and mounting of the insulator thereon greatly facilitated.

More specifically the object of the invention is to provide a pin embodying a base or standard and a securing bolt incapable of removal therefrom when in assembled position, disassociation of Lthe parts in service being consequently avoided, the structure being moreover such that the bolt itself may be simply a rod of appropriate length threaded at its ends, one end being secured to the standard portion and the other being adapted to carry the securing nut intended toengage beneath the cross arm or other structural element.

An important object of the invention is to provide a pin in which the standard is cast in such manner as to avoid the usual ridges formed at the juncture of the molding flask sections so that grinding or dressing to remove such ridges will be unnecessary, it being known that their presence interferes seriously with the screwing of the insulator onto the standard.

Still another object is to provide a pin in which the insulator engaging portion is provided with a coating which not only acts to protect the metal but also to fill and cover any cracks or other defects in the galvanizing which might occur as the result of assembling the parts in their permanently connected relation.

An additional object is to provide a pin of this type which will be simple and inexpensive to manufacture, easy to assemble and use, eflicient and durable in service, and a general improvement in the art.

To the attainment of the foregoing and other objects and advantages, the invention preferably consists in the details of construction and the arrangement and combination of parts to be hereinafter more fully described and claimed, and illustrated in the accompanying drawing in which:

Figure lis a side elevation of a pin constructed in accordance with the invention,

Figure 2 is a vertical or longitudinal section therethrough,

Figure 3 is a plan view of the upper end of the body or standard, and

Figure 4 is a fragmentary longitudinal section showing a modification.

Referring more particularly to the drawing the numeral 1` designates the main body or standard which is of elongated tubular form and preferably tapered or substantially frusto-conical with a gentle pitch throughout its major portion, one end being formed with or merging into an outstanding flange 2 which constitutes a base, and the' other end 3 being preferably thickened and of general cylindrical shape. The end 3 is formed in any convenient manner with a hole 4 leading into any desired number of pocket-like recesses 5 which need not be of any greatdepth. The hole 4 is threaded for the reception of one threaded end of the bolt -or rod 6 which extends axially of the standard or body l and which passes through an opening 7 in the base or ange 2. The bolt or rod 6 may be of any length necessary to extend through the cross arm or other structural element uponwhich the insulator is to be mounted and its projecting end is threaded and carries a washer 8 and nut 9 for effecting securing, it being of course apparent that the base 2 rests upon the top of the cross arm or other structural element with the nut and washer engaging beneath the same.

It is intended that after assembly the bolt or rod be incapable of disengagement from the body or standard and for this reason we have adopted the simple expedient of upsetting the upper end of the rod or bolt and forcing 'the metal thereof outwardly and into the recesses 5 as shown at 10.

In pins of this general class which are cast and which have a threaded end diiculty is experienced on account of the ridge which traverses the threads and which forms at the juncture of the sections of the mold. Such ridges, unless removed by a grinding operation, will interfere with screwing the insulator thimble down upon the pin. To avoid this in the making of our pin the pattern is formed with flat portions at opposite sides, that is to say the threads are omitted at diametrically opposite points and the pattern is placed in the mold in such manner that the oint between the mold sections will come at these flattened portions. The result is that when the standard or body of our pin is cast there are flat portions ll at opposite sides and it will be clear that even though ridges are present they will lie along the fiatportion and .not interfere with screwing the insulator in place. In the ordinary7 practice even if it be true that there are no appreciable ridges the threads formed by the two sections of the mold may not match. In the present scheme the omission of the threads at the diametrically opposite areas would overcome this difliculty as the variations in the threads, or lack of match thereof would not be suliiciently great to cause any ditliculty inasmuch as the ends of the threads are spaced apart.

In the making of pins of this type, and in fact most pins used in insulator work, it is customary to galvanize the metal parts to protect them against corrosion, this galvanir/ing being done, usually, before the parts are assembled. In the making of thisv particular pin it might occur that the upsetting of the end of the bolt to force the metal into the recesses 5 may impair the galvanizing at the end of the pin. As this would be objectionable we have overcome the difficulty by providing a coating l2 of some suitable material, such for instance as red lead, asphaltum or the like, this coating being applied upon the threaded end and not only filling and covering any cracks which may have formed in the galvanized surface or skin but also filling the recesses about the upset end 10 of the bolt or rod. If red lead be the substance used for coating purposes it is very probable thatit would facilitate the screwing of the insulator thimble into place as it would smooth out inequalities in the metal surface.

The. above described type of pin is intended particularly for use in connection with an insulator having an opening in which is a threaded metal thimble furnished with the insulator. In Figure et we have shown a modification in which the structure is identically the same except that the standard l is not formed with the exterior threads as in Figures l and 2 but has east upon the end a lead cob 13 which is eX- teriorly threaded. This type is intended to be screwed directly into the porcelain itself. Furthermore this type does not necessitate the application of the protective coating of red lead or the like to cover the cracks which may be formed in the galvanized skin as the result of upsetting or riveting the bolt, the lead itself performing this function.

From the foregoinfT description and a study of the drawing it will be apparent that we have thus provided a very simple` pin and one which should be inexpensive especially owing to the fact that it consists of but two parts, only one of which is specially made, the other being simply a suitable length of rod. The mode of connection of the bolt with the body or standard is such that after assembly disconnection of the parts is prevented, it being consequently possible to screw down or unscrew an insulator upon the body or standard without causing any rotation of the latter with respect to the securing bolt or rod. The various features of importance have already been stressed and a repetition thereof is unnecessary to give a full understanding of the invention to one skilled in the art.

IVhilc we have shown and described the preferred embodiments of the invention, it should be understood that the disclosure merely an exemplilication of the principles involved as the right is reserved to make all such changes in the details of construction as will widen the field of utility and increase the adaptability of the device provided such changes constitute no departure from the spirit of the invention or the scope of the. claims hereunto appended.

Having thus described the invention, we claim:

l. An insulator supporting pin comprising an elongated tubular body provided at one end with a base and having its other end interiorly threaded and its extremity formed with recesses, the base having a central hole therethrough, a rod extending axially through the body and through said hole in the base with one end screwed within the threaded end of the body and its other end projecting beyond the base, and means for securing the rod against rotation with respect to the body when in assembled position, comprising an upset end on the rod engaging within the recesses iu the end of the body.

An insulator supporting pin comprising an elongated tubular body provided at one end with a base and having its other end threaded, the base having a central hole therethrough, a rod extending axially through the body and through said hole in the base with one end screwed within the threaded end of the body and its other end projecting beyond the base, and means for securing the rod against rotation with rcspect to the body when in assembled position, comprising an upset end on the rod engaging the end of the body, the threaded end of the body being recessed for the accommodation of said upset end of the rod.

3. Aninsulator supporting pin comprising an elongated tubular body provided at one end With a base and having its other end threaded, the base having a central hole therethrough, a rod extending axially through the body and through said hole in the base With one end screwed Within the' threaded end of the body and its other end projecting beyond the base, means for securing the rod against rotation with respect to the body When in assembled position, comprising an upset end on the rod engaging the end or' the body, the threaded end of the body being recessed for the accommodation of said upset end of the rod, and a protective coating on the threaded end of the body filling said recess and covering said upset end of the rod.

4;. An insulator pin comprising a cast elongated body having a base and an exteriorly threaded end adapted to be screwed into an insulator, and means for securing the body upon a support, the threaded end of the body being flattened at diainetrically opposite relatively narrow areas to avoid the leaving of ridges and ill-matched threads during casting.

5. An insulator supporting pin comprising an elongated tubular body provided at one end with a base and having its other end adapted 'for engagement Within an insulator, a rod extending axially through the body and projecting beyond the base, said other end of the body being recessed and the corresponding end of the rod being upset to engage the recess to prevent relative rotary movement of the rod and body, and a covering on said end of the body extending thereover and over the recess and upset portion of the rod.

6. An insulator supporting pin comprising an elongated body provided at one end With a base and having its other end interiorly threaded and its extremity formed with a plurality of recesses, a rod extending axially through the body with one end screvved Within the threaded end of the body and its other end projecting beyond the base, and an upset end on the rod engaging Within the recesses in the end of the body for securing the rod against rotation With respect to the body when in assembled position.

7. An insulator supporting pin comprising a tubular body provided at one end with a base7 a rod extending axially through the body and having one end projecting beyond the base, the other end of the rod being flush With said other end of the body, means for preventing longitudinal movement o'f the rod with respect to the body, means integral With the rod at the second named end thereof coacting with said other end of the body for preventing rotary move- 

